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This one thought came to my mind just now. What's the physical significance of signal representation in negative time, i mean second and third quadrant.

So for example, sin(t) and sin(t).u(t) aren't they same for all practical purposes?

I know, mathematically they are different. But I'm trying to visualize the difference in terms of practical usage.

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# [Signals and Systems] What's the signinfance of negative time?

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